Engineering Materials MCQs

Question 1

Which of the following is not the correct method of increasing fatigue limit?

Accepted Answer

Surface decarburisation

Answer

Shot peening

Answer

Nitriding of surface

Answer

Cold working

Question 2

The property of a material which enables it to retain the deformation permanently, is called

Accepted Answer

Plasticity

Answer

Brittleness

Answer

Ductility

Answer

Malleability

Question 3

The brown smoke during the operation of a Bessemer converter indicates that the

Accepted Answer

Air is burning out silicon and manganese

Answer

Silicon and manganese has burnt and carbon has started oxidizing

Answer

The converter must be titled to remove the contents of the converter

Answer

The brown smoke does not occur during the operation of a Bessemer converter

Question 4

Iron ore is usually found in the form of

Accepted Answer

All of these

Answer

Oxides

Answer

Carbonates

Answer

Sulphides

Question 5

German silver contains

Accepted Answer

No silver

Answer

1% silver

Answer

2% silver

Answer

5% silver

Question 6

Drop forging dies contain carbon of the order of

Accepted Answer

0.6 to 0.7%

Answer

0.1 to 0.2%

Answer

0.25 to 0.5%

Answer

0.7 to 0.9%

Question 7

Combined carbon in iron makes the metal

Accepted Answer

Hard and gives a fine grained crystalline structure

Answer

Soft and gives coarse grained crystalline structure

Answer

Soft and gives a fine grained crystalline structure

Answer

Hard and gives a coarse grained crystalline structure

Question 8

Free carbon in iron makes the metal

Accepted Answer

Soft and gives a coarse grained crystalline structure

Answer

Soft and gives a fine grained crystalline structure

Answer

Hard and gives a coarse grained crystalline structure

Answer

Hard and gives a fine grained crystalline structure

Question 9

In mottled cast iron, carbon is available in

Accepted Answer

Partly in free and partly in combined state

Answer

Free form

Answer

Combined form

Answer

Nodular form